rustjail: print type of cgroup manager

Since the cgroup manager is wrapped in a dyn now, the print in
LinuxContainer::new has been useless and just says "CgroupManager". Extend the
Debug trait for 'dyn Manager' to print the type of the cgroup manager so that
it's easier to debug issues.

Fixes: #5779
Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
(cherry picked from commit ad8968c8d9)
Signed-off-by: Greg Kurz <groug@kaod.org>

src/agent/rustjail/src/cgroups/fs/mod.rs

@@ -267,6 +267,10 @@ impl CgroupManager for Manager {
     fn as_any(&self) -> Result<&dyn Any> {
         Ok(self)
     }
+
+    fn name(&self) -> &str {
+        "cgroupfs"
+    }
 }
 
 fn set_network_resources(

src/agent/rustjail/src/cgroups/mock.rs

@@ -66,6 +66,10 @@ impl CgroupManager for Manager {
     fn as_any(&self) -> Result<&dyn Any> {
         Ok(self)
     }
+
+    fn name(&self) -> &str {
+        "mock"
+    }
 }
 
 impl Manager {

src/agent/rustjail/src/cgroups/mod.rs

@@ -52,10 +52,12 @@ pub trait Manager {
     fn as_any(&self) -> Result<&dyn Any> {
         Err(anyhow!("not supported!"))
     }
+
+    fn name(&self) -> &str;
 }
 
 impl Debug for dyn Manager + Send + Sync {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
-        write!(f, "CgroupManager")
+        write!(f, "{}", self.name())
     }
 }

src/agent/rustjail/src/cgroups/systemd/manager.rs

@@ -101,6 +101,10 @@ impl CgroupManager for Manager {
     fn as_any(&self) -> Result<&dyn Any> {
         Ok(self)
     }
+
+    fn name(&self) -> &str {
+        "systemd"
+    }
 }
 
 impl Manager {